# likelihoods.io Polymarket Trending Markets

> likelihoods.io Polymarket Trending Markets is a paid API for AI agents from likelihoods.io, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Returns the latest trending markets and topics on Polymarket, including prices, liquidity, and 24-hour volume.

## Facts

- Endpoint: GET https://likelihoods.io/api/tools/polymarket/trending
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/likelihoods-io-6eff2940
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_F1AYQpRjTcIFq-bmef3cz

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability likelihoods-io-6eff2940
```

Example prompt: What are the trending markets on Polymarket right now — show me the top ones with their current yes/no prices and how much volume they've done in the last 24 hours.

## When to prefer this

Use this endpoint when you need a real-time snapshot of the most actively traded or highly liquid Polymarket prediction markets, without needing to specify a category or search term. Prefer this over market search endpoints when the user wants a broad overview of what's trending rather than a specific market or topic.

## Known failure modes

- Polymarket Gamma API unavailable — upstream service outage causing empty or error response
- Stale data if Polymarket's trending algorithm hasn't updated recently
- Payment failure (x402) if USDC balance is insufficient for the $0.01 per-call fee
- Rate limiting or authentication errors from the facilitator layer

## How this service works

Returns the latest trending markets and topics on Polymarket.

## Output

A list of trending Polymarket markets, each with a slug, question text, yes price, no price, liquidity amount, 24-hour trading volume, and closing date. Data is sourced from the Polymarket Gamma API.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {}
 }
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "source",
  "markets",
  "fetched_at"
 ],
 "properties": {
  "source": {
   "type": "string"
  },
  "markets": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "slug",
     "no_price",
     "question",
     "closes_at",
     "liquidity",
     "yes_price",
     "volume_24h"
    ],
    "properties": {
     "slug": {
      "type": "string"
     },
     "no_price": {
      "type": "number"
     },
     "question": {
      "type": "string"
     },
     "closes_at": {
      "type": "string"
     },
     "liquidity": {
      "type": "number"
     },
     "yes_price": {
      "type": "number"
     },
     "volume_24h": {
      "type": "number"
     }
    }
   }
  },
  "fetched_at": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/likelihoods-io-6eff2940/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from likelihoods.io](https://www.zero.xyz/host/likelihoods.io/llms.txt)